Note 8 - Non-accrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		$ 0
Loans receivable		1,940
Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		1,468
Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		472
State and Political Subdivisions [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		0
State and Political Subdivisions [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
State and Political Subdivisions [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Commercial Portfolio Segment [Member] | Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	$ 0	0
Loans receivable	284	311
Commercial Portfolio Segment [Member] | Commercial and industrial | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	252	278
Commercial Portfolio Segment [Member] | Commercial and industrial | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	32	33
Commercial Portfolio Segment [Member] | Construction and Land Development [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Construction and Land Development [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Construction and Land Development [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-family Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-family Properties [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-family Properties [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real Estate Secured by Owner-Occupied Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	348	175
Commercial Portfolio Segment [Member] | Real Estate Secured by Owner-Occupied Properties [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	348	175
Commercial Portfolio Segment [Member] | Real Estate Secured by Owner-Occupied Properties [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	0	165
Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	165
Commercial Portfolio Segment [Member] | State and Political Subdivisions [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	0
Commercial Portfolio Segment [Member] | State and Political Subdivisions [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Commercial Portfolio Segment [Member] | State and Political Subdivisions [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Retail Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	2,001
Retail Portfolio Segment [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	1,699
Retail Portfolio Segment [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	302
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	904	805
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	904	805
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Retail Portfolio Segment [Member] | Construction-individual [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Retail Portfolio Segment [Member] | Construction-individual [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Retail Portfolio Segment [Member] | Construction-individual [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	290	295
Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	20	21
Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	270	274
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	111	116
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	111	116
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	18	19
Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	18	19
Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Retail Portfolio Segment [Member] | Student Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	11	17
Retail Portfolio Segment [Member] | Student Loans [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	11	17
Retail Portfolio Segment [Member] | Student Loans [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Retail Portfolio Segment [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	35	37
Retail Portfolio Segment [Member] | Other Consumer [Member] | Nonaccrual With No Specifically-Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	35	37
Retail Portfolio Segment [Member] | Other Consumer [Member] | Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	$ 0	$ 0